46 AXEL OHLIN, ARCTIC CRUSTACEA. 



A ti. Exp., Swed. Arctic Exp. 1808), King Charles Island 

 (Swed. Arctic Exp. 1898), Bareiits Sea (Willem Barents Exp.), 

 Kära Sea (Dijmphna Exp.), Siberian Sea (Vega Exp.). 



Thus it seeiiis to have an exclnsively Arctic and circuni- 

 polar distribution, althougli it somewhat seldom occnrs in 

 certain regions, viz. the well explored coasts of West Green- 

 land and of West Spitzbergen. At tiie former it has only 

 once been obtained in lat 65° 35' N., long. 54° 50' W. (only 

 one spec), at tbe låter at four stations, all located in the 

 south-western part in or off Ice Fjord and Horn Sound. 

 It seems to be most abundant in the shallow and muddy 

 waters of the Barents-, Kära-, and Siberian Seas, where the 

 Gnlf Stream has very little influence, if at all. It lives in 

 moderate depths seldom exceeding 200 m. 



Length (feniale) 30 mm., breadth 8 mm. 



Diastylis Rathkii (KrÖYER). 



1840 — 41. Cuma Rathkii KröYER, Fire nye Arter etc, 1. c. p. 513, 



531, pl. 5, fig. 19—22, pl. 6, fig. 17—30. 

 1846. » » Kröyer, Voy. en Scand. etc, pl. 5, fig. 



1 a— u (?). 

 1846. » augulata Kröyer, ibidem, fig. 2 a — x (o^). 



1846. ^> Rathkii Kröyer, Karcin. Bidr. 1. c p. 144, 207, 



tab. 1, fig. 4, 6 (9). 

 1846. » angulata KrÖYER, ibidem, p. 15G, 20G, tab. 1, fig. 



2, tab. 2, fig. 1 a— i (ef). 

 1865. Diastylis Rathkii G. O. Sars, Om deu aberrante Krebs- 



dyrgruppe etc. 1. c. p. 160. 

 1873. » » G. O. Sars, Om Cumaceer fra de store 



Dybder etc. 1. c. p. 7, tab. 3, fig. 8, 9. 

 1900. ;> x> G. O. Sars, Cumacea, p. 44, pl. 33, 34. 



Diastylis RathJcii, perhaps the most common of our North- 

 ern Cumacea, was obtained 



in 1898: 

 stat. 37. lat. 81' 14' N., long. 22' 50' E., NE. of Seven Islands, depth 

 150 m., bottom temp. -I- 2° C, gray clay, 20/VIII, three spec. 



in 1899: 

 stat. 18. lat. 74° 52' N., long. 17' 16' W., depth 350 m., muddy clay, 

 some sand and pebbles, 4, VII, three spec 

 25. lat. 72' 28' N., long. 21° 48' W., depth 180 m., mud, some 

 stones, 24/VII, one spec. 

 >^ 33. lat. 70' 43' N., long. 22 29' W., Scoresby Sound, Hurry's 

 Inlet, depth 70 m., mud, 8/VIII. 



